Expansion beam for shoring up sand guards

Details Expansion beam for shoring up sand guards Expansion beam for shoring up sand guards

1984-11-02

1986-05-27

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

13761419, 405272, E21D 500

Patent

active

045912980

ABSTRACT:
A plug of an expansion beam for shoring up sand guards is equipped with a second non-return valve. If it should happen that the head of the plug is broken off owing to, for example, a falling rock, the second non-return valve works as a safety device to prevent the expansion and contraction of the expansion beam. Thus, the shoring up function is able to be maintained.

REFERENCES:
patent: 2826218 (1958-03-01), Barlow et al.
patent: 2905487 (1959-09-01), Schifter
patent: 3224201 (1965-12-01), Brunton
patent: 3230720 (1966-01-01), Bennett
patent: 3295330 (1967-01-01), Meshorer
patent: 3335573 (1967-08-01), Ward
patent: 3347049 (1967-10-01), Faltersack et al.
patent: 3791151 (1974-02-01), Plank
patent: 3851856 (1974-12-01), Berg
patent: 4009729 (1977-03-01), Vik
patent: 4527587 (1985-07-01), Fairlamb

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